Carbohydrate
Hydrolysis of lactose yields

galactose and glucose
galactose and fructose
glucose and fructose
fructose and galactose

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Carbohydrate
The multistep pathways of metabolism are efficient because they

use the same enzyme for all of the substrates in the pathway
use the same substrate for all of the enzymes in the pathway
locate all of the enzymes for a pathway in the same place within the cell
spread the enzymes for a pathway into several different organelles

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